I live in Korea and was just talking with students today about different superstitions in the East and West. My students told me about something called a "pig dream." Apparently it is considered very good luck if you dream about a pig, and if you have such a pig dream then you should go out and buy a lottery ticket since great wealth is coming your way. The only dream luckier than a pig dream in terms of money is a defecation dream, as in, you dream of being covered in excrement (!). If you have this dream (because hey, who doesn't...
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), then again, get thee to a lotto store since incredible wealth is in your future!
I think that the Korean belief in these dreams supports what other posters have said - dreaming of money is not equivalent to receiving money in real life. Dreams of cold hard cash just show that money is on your mind.